Thunder Basin Coal Company, LLC

NPDES permit WY0028193 · Minor NON-POTW · effective, expires 2030-05-31 · EPA's file as of 2026-09-19

Check this month's numbers before you file
Watch this permit — $79 a month. Every Monday, from EPA's newest files: the next report due and when, whether EPA's file holds your last one, any change to this permit's limits or status, and the renewal date.

EPA's record, 2025-09-01 to 2026-08-31

0values over a limit
0required values missing, on 0 form(s)
0of 60 forms filed late

Last period with anything received: 2026-06-30.

Reporting

Reports are due about 28 days after each monitoring period ends (the most common figure among WY permits in EPA's filings — check your permit).

Limits in force (166)

OutfallParameterStatisticLimitMonths
001pHINST MIN >= 6.5 SU all year
001pHINST MIN >= 6.5 SU all year
001pHINST MAX <= 9 SU all year
001pHINST MAX <= 9 SU all year
001Solids, total suspendedMO AVG <= 35 mg/L all year
001Solids, total suspendedMO AVG <= 35 mg/L all year
001Solids, total suspendedDAILY MX <= 70 mg/L all year
001Solids, total suspendedDAILY MX <= 70 mg/L all year
001Solids, total suspendedINST MAX <= 90 mg/L all year
001Solids, total suspendedINST MAX <= 90 mg/L all year
001Iron, total [as Fe]MO AVG <= 3.5 mg/L all year
001Iron, total [as Fe]MO AVG <= 3.5 mg/L all year
001Iron, total [as Fe]DAILY MX <= 6 mg/L all year
001Iron, total [as Fe]DAILY MX <= 6 mg/L all year
001Iron, total [as Fe]INST MAX <= 9 mg/L all year
001Iron, total [as Fe]INST MAX <= 9 mg/L all year
001DurationMO TOTAL report only all year
001DurationMO TOTAL report only all year
001Solids, total dissolvedMO AVG report only all year
001Solids, total dissolvedMO AVG report only all year
001Solids, total dissolvedDAILY MX report only all year
001Solids, total dissolvedDAILY MX report only all year
001FlowMO AVG report only all year
001FlowMO AVG report only all year
001FlowDAILY MX report only all year
001FlowDAILY MX report only all year
002pHINST MIN >= 6.5 SU all year
002pHINST MIN >= 6.5 SU all year
002pHINST MAX <= 9 SU all year
002pHINST MAX <= 9 SU all year
002Solids, total suspendedMO AVG <= 35 mg/L all year
002Solids, total suspendedMO AVG <= 35 mg/L all year
002Solids, total suspendedDAILY MX <= 70 mg/L all year
002Solids, total suspendedDAILY MX <= 70 mg/L all year
002Solids, total suspendedINST MAX <= 90 mg/L all year
002Solids, total suspendedINST MAX <= 90 mg/L all year
002Solids, settleableDAILY MX <= .5 mL/L all year
002Solids, settleableDAILY MX <= .5 mL/L all year
002Iron, total [as Fe]MO AVG <= 3.5 mg/L all year
002Iron, total [as Fe]MO AVG <= 3.5 mg/L all year
002Iron, total [as Fe]DAILY MX <= 6 mg/L all year
002Iron, total [as Fe]DAILY MX <= 6 mg/L all year
002Iron, total [as Fe]INST MAX <= 9 mg/L all year
002Iron, total [as Fe]INST MAX <= 9 mg/L all year
002DurationMO TOTAL report only all year
002DurationMO TOTAL report only all year
002Solids, total dissolvedMO AVG report only all year
002Solids, total dissolvedMO AVG report only all year
002Solids, total dissolvedDAILY MX report only all year
002Solids, total dissolvedDAILY MX report only all year
002FlowMO AVG report only all year
002FlowMO AVG report only all year
002FlowDAILY MX report only all year
002FlowDAILY MX report only all year
003pHINST MIN >= 6.5 SU all year
003pHINST MIN >= 6.5 SU all year
003pHINST MAX <= 9 SU all year
003pHINST MAX <= 9 SU all year
003Solids, total suspendedMO AVG <= 35 mg/L all year
003Solids, total suspendedMO AVG <= 35 mg/L all year
003Solids, total suspendedDAILY MX <= 70 mg/L all year
003Solids, total suspendedDAILY MX <= 70 mg/L all year
003Solids, total suspendedINST MAX <= 90 mg/L all year
003Solids, total suspendedINST MAX <= 90 mg/L all year
003Solids, settleableDAILY MX <= .5 mL/L all year
003Solids, settleableDAILY MX <= .5 mL/L all year
003Iron, total [as Fe]MO AVG <= 3.5 mg/L all year
003Iron, total [as Fe]MO AVG <= 3.5 mg/L all year
003Iron, total [as Fe]DAILY MX <= 6 mg/L all year
003Iron, total [as Fe]DAILY MX <= 6 mg/L all year
003Iron, total [as Fe]INST MAX <= 9 mg/L all year
003Iron, total [as Fe]INST MAX <= 9 mg/L all year
003DurationMO TOTAL report only all year
003DurationMO TOTAL report only all year
003Solids, total dissolvedMO AVG report only all year
003Solids, total dissolvedMO AVG report only all year
003Solids, total dissolvedDAILY MX report only all year
003Solids, total dissolvedDAILY MX report only all year
003FlowMO AVG report only all year
003FlowMO AVG report only all year
003FlowDAILY MX report only all year
003FlowDAILY MX report only all year
004pHINST MIN >= 6.5 SU all year
004pHINST MIN >= 6.5 SU all year
004pHINST MAX <= 9 SU all year
004pHINST MAX <= 9 SU all year
004Solids, total suspendedMO AVG <= 35 mg/L all year
004Solids, total suspendedMO AVG <= 35 mg/L all year
004Solids, total suspendedDAILY MX <= 70 mg/L all year
004Solids, total suspendedDAILY MX <= 70 mg/L all year
004Solids, total suspendedINST MAX <= 90 mg/L all year
004Solids, total suspendedINST MAX <= 90 mg/L all year
004Solids, settleableDAILY MX <= .5 mL/L all year
004Solids, settleableDAILY MX <= .5 mL/L all year
004Iron, total [as Fe]MO AVG <= 3.5 mg/L all year
004Iron, total [as Fe]MO AVG <= 3.5 mg/L all year
004Iron, total [as Fe]DAILY MX <= 6 mg/L all year
004Iron, total [as Fe]DAILY MX <= 6 mg/L all year
004Iron, total [as Fe]INST MAX <= 9 mg/L all year
004Iron, total [as Fe]INST MAX <= 9 mg/L all year
004DurationMO TOTAL report only all year
004DurationMO TOTAL report only all year
004Solids, total dissolvedMO AVG report only all year
004Solids, total dissolvedMO AVG report only all year
004Solids, total dissolvedDAILY MX report only all year
004Solids, total dissolvedDAILY MX report only all year
004FlowMO AVG report only all year
004FlowMO AVG report only all year
004FlowDAILY MX report only all year
004FlowDAILY MX report only all year
011pHINST MIN >= 6.5 SU all year
011pHINST MIN >= 6.5 SU all year
011pHINST MAX <= 9 SU all year
011pHINST MAX <= 9 SU all year
011Solids, total suspendedMO AVG <= 35 mg/L all year
011Solids, total suspendedMO AVG <= 35 mg/L all year
011Solids, total suspendedDAILY MX <= 70 mg/L all year
011Solids, total suspendedDAILY MX <= 70 mg/L all year
011Solids, total suspendedINST MAX <= 90 mg/L all year
011Solids, total suspendedINST MAX <= 90 mg/L all year
011Solids, settleableDAILY MX <= .5 mL/L all year
011Solids, settleableDAILY MX <= .5 mL/L all year
011Iron, total [as Fe]MO AVG <= 3.5 mg/L all year
011Iron, total [as Fe]MO AVG <= 3.5 mg/L all year
011Iron, total [as Fe]DAILY MX <= 6 mg/L all year
011Iron, total [as Fe]DAILY MX <= 6 mg/L all year
011Iron, total [as Fe]INST MAX <= 9 mg/L all year
011Iron, total [as Fe]INST MAX <= 9 mg/L all year
011DurationMO TOTAL report only all year
011DurationMO TOTAL report only all year
011Solids, total dissolvedMO AVG report only all year
011Solids, total dissolvedMO AVG report only all year
011Solids, total dissolvedDAILY MX report only all year
011Solids, total dissolvedDAILY MX report only all year
011FlowMO AVG report only all year
011FlowMO AVG report only all year
011FlowDAILY MX report only all year
011FlowDAILY MX report only all year
012pHINST MIN >= 6.5 SU all year
012pHINST MIN >= 6.5 SU all year
012pHINST MAX <= 9 SU all year
012pHINST MAX <= 9 SU all year
012Solids, total suspendedMO AVG <= 35 mg/L all year
012Solids, total suspendedMO AVG <= 35 mg/L all year
012Solids, total suspendedDAILY MX <= 70 mg/L all year
012Solids, total suspendedDAILY MX <= 70 mg/L all year
012Solids, total suspendedINST MAX <= 90 mg/L all year
012Solids, total suspendedINST MAX <= 90 mg/L all year
012Solids, settleableDAILY MX <= .5 mL/L all year
012Solids, settleableDAILY MX <= .5 mL/L all year
012Iron, total [as Fe]MO AVG <= 3.5 mg/L all year
012Iron, total [as Fe]MO AVG <= 3.5 mg/L all year
012Iron, total [as Fe]DAILY MX <= 6 mg/L all year
012Iron, total [as Fe]DAILY MX <= 6 mg/L all year
012Iron, total [as Fe]INST MAX <= 9 mg/L all year
012Iron, total [as Fe]INST MAX <= 9 mg/L all year
012DurationMO TOTAL report only all year
012DurationMO TOTAL report only all year
012Solids, total dissolvedMO AVG report only all year
012Solids, total dissolvedMO AVG report only all year
012Solids, total dissolvedDAILY MX report only all year
012Solids, total dissolvedDAILY MX report only all year
012FlowMO AVG report only all year
012FlowMO AVG report only all year
012FlowDAILY MX report only all year
012FlowDAILY MX report only all year

Built from EPA's ECHO bulk files. EPA's file, not the permit document, is the source: read your permit. Check a report before you file it · All states